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996 C4s Fault code 31.

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5 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCH996 C4s Fault code 31.

Leading reported evidence

Clean connectors

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
I would maybe start by disconnecting the battery for at least 15 minutes, then unplug the passenger's side (door) airbag and clean both connectors with electrical contact cleaner.
Original post Read captured discussion
996 C4s Fault code 31.

Read full discussion summary

Leading evidence: 'Clean connectors' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Clean connectors' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.

Read captured replies

1 matching discussions · 5 captured posts examined · 0 partial discussions

Compare 2 other evidence results

Disconnect battery

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
I would maybe start by disconnecting the battery for at least 15 minutes, then unplug the passenger's side (door) airbag and clean both connectors with electrical contact cleaner.
Original post Read captured discussion
996 C4s Fault code 31.

Inspect wiring

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
Also inspect the wiring for pinch/chafe as per the manual.
Original post Read captured discussion
996 C4s Fault code 31.

Frequently discussed actions (3)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Clean connectors

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
I would maybe start by disconnecting the battery for at least 15 minutes, then unplug the passenger's side (door) airbag and clean both connectors with electrical contact cleaner.
Original post Read captured discussion
996 C4s Fault code 31.

Disconnect battery

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
I would maybe start by disconnecting the battery for at least 15 minutes, then unplug the passenger's side (door) airbag and clean both connectors with electrical contact cleaner.
Original post Read captured discussion
996 C4s Fault code 31.

Inspect wiring

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
Also inspect the wiring for pinch/chafe as per the manual.
Original post Read captured discussion
996 C4s Fault code 31.

Coverage and how to read this overview

Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

5 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

Rennlist: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261026T105141Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Could someone help me with this, my airbag light has been on my 2002 C4s for some time now. I purchased a durametric lead so i could carry out some diagnostics. the fault code that comes up is code 31 ignition circuit, passenger. I've done some research on the forum and most of the posts say its the drivers seat belt buckle. I've purchased a new buckle from Porsche and fitted it. Cleared the code and it came back up, could someone help as in what to do next.

POST 2Original post

My research suggests the fault does *not* lie with the seat belt connector but elsewhere: Fault codes 14, 15, 30, 31, 41 -- Ignition circuit, passenger's side airbag Possible cause of fault - Short circuit to B+/ground or open circuit in the wiring between the passenger side airbag unit and the airbag triggering unit - Passenger's side airbag faulty - Triggering unit for airbag faulty

POST 3 / ORIGINAL POSTEROriginal post

Thank you for the fast reply, would you have a wiring or schematic diagram of the airbag circuit please.

POST 4Original post

Quotes source post: 12838375

Sorry but I have no wiring diagram for the 996's air bag system (or any system). However, these exist -- for instance in my 64lbs of Boxster factory manuals at least one large 3 ring binder is full of wiring diagrams/schematics -- so you might want to create a new thread with a post requesting these for your car.

POST 5Original post

I agree with Macster. Fault code 31 references the side airbag, not the seat belt. I would maybe start by disconnecting the battery for at least 15 minutes, then unplug the passenger's side (door) airbag and clean both connectors with electrical contact cleaner. Also inspect the wiring for pinch/chafe as per the manual.

This is a source reference. Confirm exact model applicability in the original material.